Kitchen extractor hood with vortex flow

Abstract

An extractor hood has a box body, an extractor fan with at least one inlet in communication with an internal chamber of the box body, a delivery fan with an inlet in communication with the internal chamber of the box body and a delivery outlet in communication with a delivery conduit, a distributor disposed at the end of the delivery conduit. The distributor has an annular body and a plurality of deflector fins that protrude from the internal surface of the annular body in such a way to generate at least one vortex-shaped flow that rotates around the axis of the distributor under the distributor and in front of the opening of the base portion of the box body through which fumes are extracted.

The invention claimed is: 
     
       1. An extractor hood comprising:
 a box body having a base portion adapted to be disposed above a cooktop, said box body defining an internal chamber; 
 an extractor fan with at least one inlet in communication with the internal chamber of said box body so as to define a depression in the internal chamber of said box body to extract fumes from the cooktop through an opening of the base portion of said box body; 
 a delivery fan with one inlet in communication with the internal chamber of said box body and one outlet in communication with a delivery conduit having one end disposed in the base portion of said box body before the opening of the base portion of said box body through which the fumes are extracted; and 
 a distributor disposed at the one end of the delivery conduit, said distributor comprising an annular body with an internal surface with a truncated-conical shape having an axis that coincides with an axis of said distributor, said distributor further comprising a plurality of deflector fins that protrude from the internal surface of the annular body towards an inside of said distributor, the plurality of deflector fins being inclined by an angle different from zero with respect to a radial straight line passing through the axis and a junction line of the plurality of deflector fins to the internal surface of the annular body of said distributor, so as to generate at least one vortex-shaped flow that rotates around the axis under said distributor and in front of the opening of the base portion of said box body through which the fumes are extracted, wherein the plurality of deflector fins have an ending edge and a circumference defined by the ending edges of the plurality of deflector fins, the circumference having a center passing through the axis of said distributor; and 
 a flange disposed above said distributor, said flange having a hole with a center that coincides with the axis of the distributor and a diameter that is less than or identical to a diameter of the circumference, wherein the delivery conduit has an internal diameter that is substantially equal to a diameter of the hole of said flange, the delivery conduit being disposed on the hole of said flange, an axis of the delivery conduit passing through the center of the hole of said flange and coinciding with the axis of said distributor. 
 
     
     
       2. The extractor hood of  claim 1 , wherein said inclination angle of the plurality of deflector fins with respect to the radial straight line is between 40° and 50°. 
     
     
       3. The extractor hood of  claim 1 , wherein the plurality of deflector fins have a curved shape with a concave part and a convex part. 
     
     
       4. The extractor hood of  claim 1 , wherein the plurality of deflector fins are equally spaced from each other, wherein each deflector fin is inclined with respect to the radial straight line by the angle that extends in clockwise direction from the radial straight line to the deflector fin to obtain a single vortex that comes out from a bottom of said distributor and rotates in clockwise direction around the axis of the distributor along a helicoidal trajectory. 
     
     
       5. An extractor hood comprising:
 a box body having a base portion adapted to be disposed above a cooktop, said box body defining an internal chamber; 
 an extractor fan with at least one inlet in communication with the internal chamber of said box body so as to define a depression in the internal chamber of said box body to extract fumes from the cooktop through an opening of the base portion of said box body; 
 a delivery fan with one inlet in communication with the internal chamber of said box body and one outlet in communication with a delivery conduit having one end disposed in the base portion of said box body before the opening of the base portion of said box body through which the fumes are extracted; and 
 a distributor disposed at the one end of the delivery conduit, said distributor comprising an annular body with an internal surface with a truncated-conical shape having an axis that coincides with an axis of said distributor, said distributor further comprising a plurality of deflector fins that protrude from the internal surface of the annular body towards an inside of said distributor, the plurality of deflector fins being inclined by an angle different from zero with respect to a radial straight line passing through the axis and a junction line of the plurality of deflector fins to the internal surface of the annular body of said distributor, so as to generate at least one vortex-shaped flow that rotates around the axis under said distributor and in front of the opening of the base portion of said box body through which the fumes are extracted; and 
 wherein said distributor comprises:
 a first set of deflector fins that extend for half of a circumference of said distributor; and 
 a second set of deflector fins disposed symmetrically to the deflector fins of said first set of deflector fins with respect to a diameter of said distributor to obtain two vortexes that come out from a bottom of said distributor, wherein the first vortex of the two vortexes rotates in a clockwise direction around the axis of the distributor along a helicoidal trajectory, wherein the second vortex of the two vortexes rotates in an anticlockwise direction around the axis of the distributor along a helicolidal trajectory, said distributor being disposed in the extractor hood such that the two vortexes meet in a position of the opening of said box body disposed behind said distributor. 
 
 
     
     
       6. The extractor hood of  claim 5 , wherein an inclination angle of each deflector fin of the first set of deflector fines with respect to the radial straight line is between 40° and 50° and extends in a clockwise direction from the radial straight line to the deflector fin, and wherein the inclination angle of each deflector fin of the second set of deflector fins with respect to the radial straight line is between 40° and 50° and extends in an anticlockwise direction from the radial straight line to the deflector fin. 
     
     
       7. The extractor hood of  claim 1 , wherein said extractor fan, said delivery fan and said delivery conduit are disposed inside said box body.